The Distribution of Benthic Foraminifera in the Celtic Sea: The Significance of Seasonal Stratification

Scott, George A.

doi:10.2113/0330032

Cited by 49 publications

(27 citation statements)

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“…Stable carbon isotopic data from the same species, measured through the same core intervals, showed a negative trend consistent with decomposition of organic matter and oxygen consumption beneath the productive frontal zone separating tidally mixed from stratified water masses. The foraminiferal faunal analyses, in the light of modem foraminiferal distributional data (Scott et aL, 2003), also support the inference that the succession can be interpreted as a response to the progressive seasonal stratification of the Celtic Sea during the Holocene. In particular, the faunal data highlight the value of key taxa as indicators of shelf palaeostratification in the geological record, notably of Textularia bocki and Stainforthia fusiformis as mixed-frontal and frontal-stratified indicators, respectively.…”

supporting

confidence: 58%

Stable isotopic analyses of modern benthic foraminifera from seasonally stratified shelf seas: disequilibria and the 'seasonal effect'

Scourse

Kennedy²,

Scott

et al. 2004

The Holocene

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Previously published stable isotopic data on benthic foraminiferal species from a Holocene sequence in the Celtic Sea have been interpreted in terms of the progressive replacement of a tidally mixed by a stratified water mass. Offsets in the 6180 data between Ammonia batavus and Quinqueloculina seminuluin were attributed to a 'seasonal effect' in which these two species were hypothesized to have calcified at different times of the year. The aims of this study were to test the hypotheses (1) that benthic foraminiferal stable isotope records from across the Celtic Sea front reflect seasonal stratification and (2) that offsets in the oxygen isotope record between different species are the result of the postulated seasonal effect. Hypothesis 1 was tested through investigation of live and dead benthic foraminiferal and bottom-water 6180 and f X13C sampled in transects across the Celtic Sea front from mixed through frontal to stratified water masses. Q. seminulum calcifies during September when peak bottom-water temperatures occur, while A. batavus calcifies during September in stratified localities, but during spring or early summer in mixed localities. This study confirms the interpretation of the 6180 palaeodata from the Celtic Sea as a palaeostratification record and demonstrates that 6180 data from shelf-sea cores can be used to supplement benthic foraminiferal assemblages as a tool for reconstructing the long-term dynamics of seasonal stratification.

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confidence: 58%

Stable isotopic analyses of modern benthic foraminifera from seasonally stratified shelf seas: disequilibria and the 'seasonal effect'

Scourse

Kennedy²,

Scott

et al. 2004

The Holocene

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“…Early studies of benthic foraminifera from the Celtic Sea and western English Channel depicted a correlation between the faunal variations and water depth, sediment type, and tidal and current regimes (Le Calvez 1958;Le Calvez and Boillot 1967;Murray 1970;Murray 1979;Sturrock and Murray 1981;Murray et al 1982;Weston 1985;Scott et al 2003). Further investigations of suspended sediment samples showed that small, dead foraminiferal tests (<200 µm) were suspended and transported from areas with powerful vertical turbulences and mixing (e.g., English Channel) to areas with a thermally stratified water column (e.g., South…”

Section: Previous Workmentioning

confidence: 99%

“…Environmental parameters such as food supply and oxygen concentrations in pore and bottom waters are linked to seasonal stratification and vary from mixed to stratified waters. These parameters are the primary controlling factors on the distribution of benthic foraminiferal assemblages (Weston 1985;Scott et al 2003).…”

Section: Previous Workmentioning

confidence: 99%

“…A reason for this pattern could be the time of sampling combined with a higher food supply. The growth of some species was favored during the summer months, when under a stratified water column a higher organic carbon concentration in the sediment prevailed (Scott et al 2003). Samples of Sturrock and Murray (1981) were taken before the vertical mixing of the water column in autumn.…”

Section: Distribution Pattern Of Abundant Species In the Living Faunamentioning

confidence: 99%

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Recent benthic foraminiferal assemblages from the Celtic Sea (South Western Approaches, NE Atlantic)

Dorst

Schönfeld

Walter³

2014

Paläontol Z

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The faunal composition and diversity pattern of Recent benthic foraminifera from the shelf and slope of the South Western Approaches (Celtic Sea) were assessed. The sampling stations cover a depth range from 100 to 500 m. A total number of 294 species was recorded, of which 89 were found exclusively in the living fauna and 118 only in the dead assemblage, whereas 87 species were found in both assemblages. The faunal composition revealed a distinct bisection of the living fauna on the shelf. While certain distribution patterns of living dominant species were recognized along a NE-SW trending transect towards the shelf edge, the living fauna changed within small depth intervals and geographic position on the slope.Causes for this structured slope assemblages were probably along-slope currents of varying strengths, as well as variations in topography and bottom sediments. Analyses of population densities and diversity patterns determined high densities along the shelf edge and at one slope station, as well as an increasing diversity with water depth. A comparison with literature data from the same area yields distinct differences in faunal composition on the shelf and slope. The diversity was similar on the shelf, but higher at corresponding stations on the slope. We conclude that the faunal composition was highly influenced by the time and methods of sampling. In order to obtain consistent results in regional studies, all samples 1 should be taken in a short time interval and by using the same sampling device. In addition, we depicted the influences of environmental parameters on dead faunal assemblages and their consequences for paleoenvironmental interpretations of fossil foraminiferal assemblages. Keynotes

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“…These surfaces are diachronous, and their nature varies depending on the location within the Bay. (Scourse et al, 2002;Scott et al, 2003). Furthermore, Bulimina types are infaunal and are associated with fine grained, organic carbon-rich sediments and lowered oxygen levels in the water column (Kristensen and Sejrup, 1996).…”

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confidence: 99%

Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

et al. 2015

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'Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland.', Marine geology., 369 . pp. 251-272. Further information on publisher's website: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractIreland experienced a spatially complex pattern of relative sea-level (RSL) changes and shoreline development caused by the interplay of isostatic and eustatic (ice equivalent sea level) processes since the Last Glacial Maximum (LGM). Using a combination of high-resolution marine geophysical data, vibrocores, foraminiferal analysis and 10 AMS radiocarbon dates, we reconstruct the Late Quaternary evolution and RSL history of Bantry Bay, a large (40 km long, 5-10 km wide) embayment in SW Ireland.The data indicate two infill phases: one before and one after the LGM, separated by glacial and lowstand sediments. The pre-LGM history is not dated and the depositional history is inferred. A large sediment lobe formed at the outer edge of Bantry Bay as a lowstand ice-proximal glacimarine outwash system as the ice retreated after the LGM, at a sea level ca. 80 m lower than present.Iceberg scour immediately west of this location likely relate to the break-up of the local Kerry-Cork Ice Cap. Long curvilinear ridges, seen both offshore and on top of the sediment lobe, probably formed as shoreface ridges under stronger-than-present tidal currents during a period of RSL stability (pre-14.6 ka cal BP). A subsequent infill phase is characterised by a basin-wide erosional (ravinement) surface and the deposition of inter-and sub-tidal estuarine sediments. Although our data support the general trends, our stratigraphic and radiocarbon data suggest a higher sea level between 11 and 13.5 ka cal BP than predicted by existing glacial isostatic adjustment models.

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The Distribution of Benthic Foraminifera in the Celtic Sea: The Significance of Seasonal Stratification

Cited by 49 publications

References 49 publications

Stable isotopic analyses of modern benthic foraminifera from seasonally stratified shelf seas: disequilibria and the 'seasonal effect'

Stable isotopic analyses of modern benthic foraminifera from seasonally stratified shelf seas: disequilibria and the 'seasonal effect'

Recent benthic foraminiferal assemblages from the Celtic Sea (South Western Approaches, NE Atlantic)

Late Quaternary evolution and sea-level history of a glaciated marine embayment, Bantry Bay, SW Ireland

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